I think this only becomes a problem if technology evolves faster than people change. All those "calculator" employees got better jobs. People keep making the analogy of how cars completely replaced horses (I used to as well) but horses can't fundamentally change what they are capable of.

Even if the technology does evolve faster than people, governments can make sure people don't get impacted. Coal plants are more expensive to operate, worse for the environment, and less efficient but the coal industry is still kicking along for better or for worse.

Calculation is not dead! Finding more efficient ways to do calculations was and still is an active branch of mathematics and computer science. It’s just called algorithms now.

PageRank was essentially an efficient way to compute / approximate the leading eigenvector of a very large matrix.

> "Calculator" used to be a job description

It was computer, not calculator.